package com.sunyard.utils;

import org.apache.poi.hssf.usermodel.*;

import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;

/**
 * Created by Administrator on 2018/1/15.
 */
public class ExcelOutput {

    //显示的导出表的标题
    private String title;
    //导出表的列名
    private String[] rowName;

    private List<Object[]> dataList = new ArrayList<Object[]>();

    HttpServletResponse response;


    //构造方法，传入要导出的数据
    public ExcelOutput(String title, String[] rowName, List<Object[]> dataList) {
        this.dataList = dataList;
        this.rowName = rowName;
        this.title = title;
    }

    /*
     * 导出数据
     * */
    public void export(OutputStream out) throws Exception {
        try {
            HSSFWorkbook workbook = new HSSFWorkbook();                     // 创建工作簿对象
            HSSFSheet sheet = workbook.createSheet(title);                  // 创建工作表

            // 产生表格标题行
            //          HSSFRow rowm = sheet.createRow(0);
            //          HSSFCell cellTiltle = rowm.createCell(0);

            //sheet样式定义【getColumnTopStyle()/getStyle()均为自定义方法 - 在下面  - 可扩展】
            HSSFCellStyle columnTopStyle = this.getColumnTopStyle(workbook);//获取列头样式对象
            HSSFCellStyle style = this.getStyle(workbook);                  //单元格样式对象

            //          sheet.addMergedRegion(new CellRangeAddress(0, 1, 0, (rowName.length-1)));//合并单元格  
            //          cellTiltle.setCellStyle(columnTopStyle);
            //          cellTiltle.setCellValue(title);

            // 定义所需列数
            int columnNum = rowName.length;
            HSSFRow rowRowName = sheet.createRow(0);                // 在索引2的位置创建行(最顶端的行开始的第二行)

            // 将列头设置到sheet的单元格中
            for (int n = 0; n < columnNum; n++) {
                HSSFCell cellRowName = rowRowName.createCell(n);               //创建列头对应个数的单元格
//                cellRowName.setCellType(HSSFCell.CELL_TYPE_STRING);             //设置列头单元格的数据类型
                HSSFRichTextString text = new HSSFRichTextString(rowName[n]);
                cellRowName.setCellValue(text);                                 //设置列头单元格的值
                cellRowName.setCellStyle(columnTopStyle);                       //设置列头单元格样式
            }

            //将查询出的数据设置到sheet对应的单元格中
            if (dataList != null && dataList.size() > 0) {
                for (int i = 0; i < dataList.size(); i++) {

                    Object[] obj = dataList.get(i);//遍历每个对象
                    HSSFRow row = sheet.createRow(i + 1);//创建所需的行数（从第二行开始写数据）

                    for (int j = 0; j < obj.length; j++) {
                        HSSFCell cell = row.createCell(j);   //设置单元格的数据类型
//                    if(j == 0){
//                        cell = row.createCell(j, HSSFCell.CELL_TYPE_NUMERIC);
//                        cell.setCellValue(i+1);
//                    }else{
//                        cell = row.createCell(j, HSSFCell.CELL_TYPE_STRING);
//                        if(!"".equals(obj[j]) && obj[j] != null){
//                            cell.setCellValue(obj[j].toString());                       //设置单元格的值
//                        }
//                    }
//                        cell = row.createCell(j, HSSFCell.CELL_TYPE_STRING);
                        if (!"".equals(obj[j]) && obj[j] != null) {
                            cell.setCellValue(obj[j].toString());                       //设置单元格的值
                        } else {
                            cell.setCellValue("");
                        }
                        cell.setCellStyle(style);                                   //设置单元格样式
                    }
                }

                //让列宽随着导出的列长自动适应
                for (int colNum = 0; colNum < columnNum; colNum++) {
                    int columnWidth = sheet.getColumnWidth(colNum) / 256;
                    for (int rowNum = 0; rowNum < sheet.getLastRowNum(); rowNum++) {
                        HSSFRow currentRow;
                        //当前行未被使用过
                        if (sheet.getRow(rowNum) == null) {
                            currentRow = sheet.createRow(rowNum);
                        } else {
                            currentRow = sheet.getRow(rowNum);
                        }
                        //                 if (currentRow.getCell(colNum) != null) {
                        //                     HSSFCell currentCell = currentRow.getCell(colNum);
                        //                      if (currentCell.getCellType() == HSSFCell.CELL_TYPE_STRING) {
                        //                          int length =     currentCell.getStringCellValue().getBytes().length;
                        //                          if (columnWidth < length) {
                        //                              columnWidth = length;
                        //                          }
                        //                      }
                        //                  }
                        if (currentRow.getCell(colNum) != null) {
                            HSSFCell currentCell = currentRow.getCell(colNum);
//                            currentCell.getCellType() == HSSFCell.CELL_TYPE_STRING
                            if (true) {
                                int length = 0;
                                try {
                            	/*if( currentCell.getStringCellValue().getBytes()!=null){
                                length = currentCell.getStringCellValue().getBytes().length;
                            	}*/
                                } catch (Exception e) {
                                    e.printStackTrace();
                                }
                                if (columnWidth < length) {
                                    columnWidth = length;
                                }
                            }
                        }

                    }
                    if (colNum == 0) {
                        sheet.setColumnWidth(colNum, (columnWidth - 2) * 256);
                    } else {
                        sheet.setColumnWidth(colNum, (columnWidth + 4) * 256);
                    }
                }
            }


            if (workbook != null) {
                try {
                    workbook.write(out);
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            out.close();
        }

    }

    /*
     * 列头单元格样式
     */
    public HSSFCellStyle getColumnTopStyle(HSSFWorkbook workbook) {

        // 设置字体
        HSSFFont font = workbook.createFont();
        //设置字体大小
        font.setFontHeightInPoints((short) 11);
        //字体加粗 TODO 下面方法不能用
        //font.setBold(true);
        //设置字体名字 
        font.setFontName("Courier New");
        //设置样式; 
        HSSFCellStyle style = workbook.createCellStyle();
        //设置底边框; 
//        style.setBorderBottom(BorderStyle.THIN);
        //设置底边框颜色;  
//        style.setBottomBorderColor(HSSFColor.BLACK.index);
        //设置左边框;   
//        style.setBorderLeft(BorderStyle.THIN);
        //设置左边框颜色; 
//        style.setLeftBorderColor(HSSFColor.BLACK.index);
        //设置右边框; 
//        style.setBorderRight(BorderStyle.THIN);
        //设置右边框颜色; 
//        style.setRightBorderColor(HSSFColor.BLACK.index);
        //设置顶边框; 
//        style.setBorderTop(BorderStyle.THIN);
        //设置顶边框颜色;  
//        style.setTopBorderColor(HSSFColor.BLACK.index);
        //在样式用应用设置的字体;  
        style.setFont(font);
        //设置自动换行; 
        style.setWrapText(false);
        //设置水平对齐的样式为居中对齐;  
//        style.setAlignment(HorizontalAlignment.CENTER);
        //设置垂直对齐的样式为居中对齐; 
//        style.setVerticalAlignment(VerticalAlignment.CENTER);

        return style;

    }

    /*
     * 列数据信息单元格样式
     */
    public HSSFCellStyle getStyle(HSSFWorkbook workbook) {
        // 设置字体
        HSSFFont font = workbook.createFont();
        //设置字体大小
        //font.setFontHeightInPoints((short)10);
        //字体加粗
        //font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
        //设置字体名字 
        font.setFontName("Courier New");
        //设置样式; 
        HSSFCellStyle style = workbook.createCellStyle();
        //设置底边框; 
//        style.setBorderBottom(BorderStyle.THIN);
        //设置底边框颜色;  
//        style.setBottomBorderColor(HSSFColor.BLACK.index);
        //设置左边框;   
//        style.setBorderLeft(BorderStyle.THIN);
//        设置左边框颜色;
//        style.setLeftBorderColor(HSSFColor.BLACK.index);
        //设置右边框; 
//        style.setBorderRight(BorderStyle.THIN);
        //设置右边框颜色; 
//        style.setRightBorderColor(HSSFColor.BLACK.index);
        //设置顶边框; 
//        style.setBorderTop(BorderStyle.THIN);
        //设置顶边框颜色;  
//        style.setTopBorderColor(HSSFColor.BLACK.index);
        //在样式用应用设置的字体;  
        style.setFont(font);
        //设置自动换行; 
        style.setWrapText(false);
        //设置水平对齐的样式为居中对齐;  
//        style.setAlignment(HorizontalAlignment.CENTER);
        //设置垂直对齐的样式为居中对齐; 
//        style.setVerticalAlignment(VerticalAlignment.CENTER);

        return style;

    }
}
